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[Chiara Modenese <question199540@xxxxxxxxxxxxxxxxxxxxx>]

Question #199540 on Yade changed:
https://answers.launchpad.net/yade/+question/199540

    Status: Open => Answered

Chiara Modenese proposed the following answer:
Hi Bruno,

If I am not wrong:

Law2_SCG_MomentPhys_CohesionlessMomentRotation is a duplicate of Law2_ScGeom6D_CohFrictPhys_CohesionMoment (but with less features than the latter)
Law2_SCG_MomentPhys_CohesionlessMomentRotation is the only Law that implements the rolling resistance using quaternions (actually there is something similar about twist_creep in Law2_ScGeom6D_CohFrictPhys_CohesionMoment) which I would not recommend as I am not sure it always gives the expected result (has anybody tested it properly?)
In principle the rolling resistance implemented in Law2_SCG_MomentPhys_CohesionlessMomentRotation does not seem to be doing anything different than what is already implemented in Law2_ScGeom6D_CohFrictPhys_CohesionMoment which, however, uses an incremental fashion (a copy of what I introduced in the Law2_ScGeom_MindlinPhys_Mindlin Law) that seems to work fine from what I gathered
Why do you say it implements irreversible rolling friction?

Finally, I would remove it if nobody is using it.

Thanks!
Chiara


On 6 Jun 2012, at 09:01, Chareyre wrote:

> New question #199540 on Yade:
> https://answers.launchpad.net/yade/+question/199540
> 
> Hi all,
> 
> I'd like to remove some of the contact laws which are in Yade. Some of them are unmaintained and/or broken and/or duplicates, and too many contact laws is only making the choice uneasy.
> If you are using some of the contact laws listed below, please reply to this message, else it will be removed eventually.
> 
> Law2_Dem3Dof_CSPhys_CundallStrack
> Law2_Dem3DofGeom_FrictPhys_CundallStrack
> Law2_SCG_MomentPhys_CohesionlessMomentRotation
> Law2_Dem3DofGeom_RockPMPhys_Rpm
> Law2_L3Geom_FrictPhys_ElPerfPl
> Law2_L6Geom_FrictPhys_Linear
> 
> More details at https://blueprints.launchpad.net/yade/+spec/cleancontactlaws
> 
> -- 
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